Parabolic spotlight fixture having rotatable lamp holder

ABSTRACT

A spotlight fitting for use with standard service lamps has a laterally extending lamp-holder, an auxiliary reflector in front of the lamp position, to conceal the lamp filament and to reflect forwardly projected light rays, and the lamp holder is rotatable to permit focusing of the lamp filament relative to the reflectors.

United States Patent Heritage Sept. 3, 1974 [54] PARABOLIC SPOTLIGHTFIXTURE 1,895,906 l/1933 Arbuckle 240/416 HAVING ROTATABLE LAMP HOLDER1,927,285 9/1933 Hurrell et al. 240/46.55 2,014,076 9/1935 Wellman240/44.2 [75] Inventor: R ert H r ag M a ng 2,977,461 3/1961 Jones 240442 3,012,798 12/1961 Berger 240/52 R [73] Assgnee' Rmaflex (Great3,157,088 11/1964 Zillmer 240/44.2

London, England [22] Filed: May 14, 1973 Primary Exa'minerRichard L.Moses [21] Appl' 360350 Attorney, Agent, or FirmArthur B. Colvin [30]Foreign Application Priority Data May 22, 1972 Great Britain 23943/72[57] ABSTRACT [52] US. Cl 240/44.2, 240/41.1, 240/44 R,

240/46.01 A spotlight fitting for use with standard service lamps [51]Int. Cl. F2lv 19/02 has a laterally extending lamp-holder, an auxiliaryre- [58] Field of Search 240/41.37, 41.15, 41.1, flector in front of thelamp position, to conceal the 240/41.6, 44.2, 44 R, 44.1, 46.01, 52 R,73 R lamp filament and to reflect forwardly projected light rays, andthe lamp holder is rotatable to permit focus- [56] References Cited ingof the lamp filament relative to the reflectors.

UNITED STATES PATENTS 1,575,327 3/1926 Garford et a1. 240/46.55 X 1Claim, 2 Drawing Figures PARABOLIC SPOTLIGHT FIXTURE HAVING ROTATABLELAMP HOLDER Spotlights employing parabolic reflectors and in which alamp is positioned in front of the reflector, require part silveredlamps, which are expensive items.

The present invention relates to an improved spotlight construction, inwhich standard service lamps can be employed.

More specifically, the invention provides a spotlight fitting comprisinga main parabolic reflector, a lampholder whose axis extends transverselyof the reflector to position a lamp in front of the reflector, anauxiliary reflector mounted on the front of the fitting to conceal thelamp filament and having a concave rear reflector surface for reflectingforwardly projecting light rays back on to the parabolic reflector, andmeans for rotating the lamp-holder about its own axis. The rotarymounting of the lamp-holder makes it possible to adjust the orientationof the lamp filament, relative to the reflectors, and thereby obtain anoptimum lighting effect from a standard service lamp.

One form of spotlight in accordance with the invention will now bedescribed, by way of example, with reference to the accompanyingdrawings, in which:

FIG. 1 is a front elevation of the spotlight;

FIG. 2 is a cross-sectional elevation.

The spotlight comprises a parabolic reflector l (preferably die-cast),one radially extending peripheral portion 2 of which is recessed oroffset to receive a lampholder 3. A cover member 4 is secured to thebody of the reflector by fixing screws 6, to form with the reflectorportion 2 a generally cylindrical housing for the lampholder, which isretained in the housing by means of a mounting bracket 7 secured to thebase of the lamp holder and which bracket is secured to the cover member4 by a thumb-screw 8. This screw is engaged in a threaded hole in thebracket and extends outwardly through a circumferentially extended slot9 in the cover member 4, thus permitting rotation of the bracket andlampholder about the axis 10 of the lampholder, relative to reflector 1.This adjustability permits focussing of a lamp filament by varying itsorientation relative to the reflector 1.

A cable entry gland assembly 11 extends through transverse end walls 1and 4 of the reflector and cover member and also provides a pivotalattachment for a mounting bracket B.

Removably secured to the cover member 4 is an auxiliary reflector 12(conveniently formed as a diecasting), the main reflecting surface 13 ofwhich is concave, generally part-spherical form so as to conform closelyto the globe of a standard service lamp shown in phantom line at L. Theauxiliary reflector thus serves in use to reflect any forwardly directedlight rays rearwardly onto the parabolic reflector. This function is, ofcourse, normally carried out by the part silvering on special purposelamps normally required for parabolic reflector spotlights. Thus thespotlight of the present invention is adapted for use with standardservice lamps, which are much cheaper than part silvered spotlightlamps.

The releasable attachment of the auxiliary reflector is conveniently,effected in this embodiment with the aid of a thumbscrew l4, threadedlyengaged in a radially extending tongue 15 of the auxiliary reflectorwhich is engaged in a corresponding slot 16 in the cover member 4. Theauxiliary reflector is simply secured by tightening the screw 14 toengage against the cover member adjacent the end of slot 16.

The auxiliary reflector is thus readily released to facilitate insertionand removal of lamps L and resecured in its proper position relative tothe parabolic reflector 1.

I claim:

1. A spotlight fitting for use with a standard unsilvered service lampcomprising a main parabolic reflector, lamp holder means having its axisextending in a direction transversely of the reflector for positioning alamp supported in said holder means in front of said main reflector,auxiliary reflector means having a concave rear reflector surface, saidauxiliary reflector means being mounted on said fitting and disposedforwardly of said holder for concealing the filament of a lamppositioned in said holder and reflecting forwardly projected light raysback into the main reflector, and adjustment means interposed betweensaid main reflector and said lamp holder supporting said lamp holder forrotation about its own axis relative to said main reflector to enablevariation of the orientation of the filament of a lamp in said holderrelative to said main reflector.

1. A spotlight fitting for use with a standard unsilvered service lampcomprising a main parabolic reflector, lamp holder means having its axisextending in a direction transversely of the reflector for positioning alamp supported in said holder means in front of said main reflector,auxiliary reflector means having a concave rear reflector surface, saidauxiliary reflector means being mounted on said fitting and disposedforwardly of said holder for concealing the filament of a lamppositioned in said holder and reflecting forwardly projected light raysback into the main reflector, and adjustment means interposed betweensaid main reflector and said lamp holder supporting said lamp holder forrotation about its own axis relative to said main reflector to enablevariation of the orientation of the filament of a lamp in said holderrelative to said main reflector.